In-vac PD/QPD layout meeting 2025/02/28

Time: Feb 28, 2025 14:00-14:40

Participants: Ray-Kuang Lee, Huali Chen, Yoichi Aso, Yuta Michimura

Zoom meeting

Minutes

• Huali showed almost the final layout idea for AS RF and OMC REFL, with squeezing injection optics.
  • OSTM transmission seems different from CAD
    • Probably because OSTM wedge is not included in Huali's calculations
  • Add periscopes for AS RF in-vac path and OMC REFL path, and a beam diverter for AS RF in-vac path
    • Adding periscopes can reduce the height from approx. 210 mm to 4 inch, and we can use smaller and lighter pedestals
  • Check if OMC shroud is not conflicting
• Next step is to collect comments for AS and to start REFL/POP planning
  • New student might be available
  • REFL/POP should be done by around summer

• A/I

  • Update the layout to include periscopes and a beam diverter, add a wedge to OSTM and upload the layout to JGWdoc [Huali]
    • OSTM is 100 mm dia, 30 mm thick, with wedge of 2 deg

    • Thicker side is OMC side from the drawing, but actually installed flipped, so thinner side is OMC side (see Fig. 2 of klog #30159)

  • Find OMC shroud drawing [Michimura]

    • https://gwdoc.icrr.u-tokyo.ac.jp/cgi-bin/private/DocDB/ShowDocument?docid=15840

    • https://gwdoc.icrr.u-tokyo.ac.jp/cgi-bin/private/DocDB/ShowDocument?docid=15865

    • https://gwdoc.icrr.u-tokyo.ac.jp/cgi-bin/private/DocDB/ShowDocument?docid=16104

  • Updated layout will be shared with relevant people for comments [Michimura]
  • Collect information for REFL and start the REFL layout planning (... and POP next) [Michimura]
• Next meeting: TBD on the week of March 24, with a new student